Free Construction Material Calculators
WorksiteCalc helps you work out how much material a job needs before you buy it. Choose your project, enter your dimensions, and get quantities you can take to a supplier.
Choose your project type
Concrete Calculator
Slabs, footings, walls, blocks and rebar. Volume, bag count and cost.
Asphalt Calculator
Asphalt quantity and coverage for driveways, lots and repairs.
Roof Pitch Calculator
Pitch, slope and roof area for rafters and material orders.
Board Foot Calculator
Board feet and framing quantities before you price an order.
Gravel Calculator
Gravel, sand and fill converted to cubic yards and tons.
Stair Calculator
Stair rise and run, plus material counts for steps and fence lines.
Paint Calculator
Paint and wall coverage by room and surface.
Cubic Feet Calculator
Cubic feet, area and unit conversions that feed every other calculator.
No calculators match your search. Try “concrete”, “gravel” or “paint”.
How WorksiteCalc calculates
Every calculator is built around a published formula shown next to the result. Where a recognised standard applies, such as ACI 318 for structural concrete or ASTM C90 for concrete masonry units, the page names it. Results are planning estimates: each page states its waste allowance and what the figure does not include.
A worked example
Worked Example
A concrete slab 10 ft long, 10 ft wide and 4 in thick:
10 × 10 × (4 ÷ 12) = 33.3 cubic feet
33.3 ÷ 27 = 1.23 cubic yards
Adding a 5 to 10 percent waste allowance gives an order quantity of about 1.30 to 1.36 cubic yards.
Our calculator standards
Before a calculator is published on WorksiteCalc, it must:
- show its formula and units
- cite a standard where one applies
- include a worked example
- state its waste allowance and assumptions
Frequently asked questions
What is a construction material calculator?
It converts your project dimensions into the quantity of material to order, such as cubic yards of concrete, bags of mix, tons of gravel or gallons of paint.
How accurate are the results?
They are estimates based on standard formulas. Subgrade, local supplier sizes and site conditions change real quantities, so confirm figures with your supplier before ordering.
How much extra material should I order?
A waste allowance of 5 to 10 percent suits simple shapes. Irregular shapes and uneven ground usually need more.
Can I use a calculator result instead of a professional’s advice?
No. For structural work or major spending, consult a licensed contractor or engineer. See our Terms of Use.
WorksiteCalc is an independent, free construction calculator site for builders, contractors and homeowners.